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Título : Differential Cooperation between Regulatory Sequences required for Human CD53 Gene Expression
Autor : Hernández-Torres, Javier; Yunta, M.; Lazo, Pedro A.
Palabras clave : CD53
Tetraspanin
Fecha de publicación : sep-2001
Editor: American Society for Biochemistry and Molecular Biology
Citación : Journal of Biological Chemistry 276(38): 35405–35413 (2001)
Resumen: CD53 is a tetraspanin protein mostly expressed in to the lymphoid-myeloid lineage. We have characterized the human CD53 gene regulatory region. Within the proximal 2 kilobases, and with opposite transcriptional orientation, is located the promoter-enhancer of a second gene, which does not affect CD53. Twenty-four copies of a CA dinucleotide repeat separate these two gene promoters. The proximal enhanceosome of the human CD53 gene is comprised between residues 266 and 84, and can be subdivided into four major subregions, two of them within exon 1. Mutational analysis identified several cooperating sequences. An Sp1 and an ets-1 site, at positions 115 and 62, respectively, are essential for transcriptional competence in all cell lines. Five other regulatory sequences have a dual role, activator or down-regulator, depending on the cell line. At the end of the non-coding exon 1, 64 to 83, there is a second ets-1 regulatory element, which is required for high level of transcription, in cooperation with the Sp1 site, in K562 and Molt-4, but not in Namalwa cells, where it functions as a repressor. This Sp1 site also cooperates with another ets-1/PU.1 site at 172. Different cell types use different regulatory sequences in the enhanceosome for the expression of the same gene.
Versión del editor: htt://dx.doi.org/10.1074/jbc.M104723200
URI : http://hdl.handle.net/10261/6989
DOI: 10.1074/jbc.M104723200
ISSN: 0021-9258
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